19940338466 has 4 divisors (see below), whose sum is σ = 29910507702. Its totient is φ = 9970169232.

The previous prime is 19940338463. The next prime is 19940338469. The reversal of 19940338466 is 66483304991.

It is a semiprime because it is the product of two primes.

It is an interprime number because it is at equal distance from previous prime (19940338463) and next prime (19940338469).

It can be written as a sum of positive squares in only one way, i.e., 19933204225 + 7134241 = 141185^2 + 2671^2 .

It is a Curzon number.

It is not an unprimeable number, because it can be changed into a prime (19940338463) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 4985084615 + ... + 4985084618.

Almost surely, 2^19940338466 is an apocalyptic number.

19940338466 is a deficient number, since it is larger than the sum of its proper divisors (9970169236).

19940338466 is an equidigital number, since it uses as much as digits as its factorization.

19940338466 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 9970169235.

The product of its (nonzero) digits is 3359232, while the sum is 53.

The spelling of 19940338466 in words is "nineteen billion, nine hundred forty million, three hundred thirty-eight thousand, four hundred sixty-six".